Frequency converter for different mains voltages

a technology of frequency converter and mains voltage, which is applied in the direction of ac-dc conversion, single-phase induction motor starter, power electronics conversion efficiency, etc., can solve the problems of voltage drop, increase the current sink of mains, etc., and achieve the effect of increasing the operational reliability, and reducing the output power of the inverter
US7221121B2Inactive Publication Date: 2007-05-22DANFOSS DRIVES
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
DANFOSS DRIVES
Publication Date
2007-05-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention is directed to controlling an electric motor by means of a frequency converter. The frequency converter can be connected to one of several different mains voltages. According to the present invention, the maximum output power of the frequency converter, is limited when the actual mains voltage is lower than the maximum nominal mains voltage, for which the frequency converter is designed, and during the limitation the frequency converter controls the speed of the motor within a power range up to a limited maximum output power. This gives a genuine multi-voltage unit, which can be connected to a wide range of mains voltages.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is entitled to the benefit of and incorporates by reference essential subject matter disclosed in International Application No. PCT / DK02 / 00785 filed on Nov. 21, 2002, Danish Patent Application No. PA 2001 01750 filed on Nov. 23, 2001 and Danish Patent Application No. PA 2001 01751 filed on Nov. 23, 2001.FIELD OF THE INVENTION

[0002] The invention concerns a frequency converter, which can be connected to one of several different mains voltages, and a method for speed control of an electric motor by means of a frequency converter.BACKGROUND OF THE INVENTION

[0003] Differences in the mains voltages in the USA and Europe increase the production costs, as product differentiation is required. For years, therefore, it has been known to make frequency converters, which can be connected to different mains voltages, see for example U.S. Pat. No. 4,656,571.

[0004] However, this gives rise to a problem, when a frequency converter is connec...

Claims

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